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Um... As a bit of a computer history geek, the "Mac stole their GUI from Xerox" idea is BS.

The Xerox Star was a word-processor and graphic design system, it was *not* a general computer interface. It was designed specifically for creating documents, and organising the types of items you would have in those documents. The only way to purchase a Xerox Star initially was as part of a full "personal office system" intended to replace an entire traditional office and installed by Xerox, then later with purchase of a Xerox Laser Printer. The Xerox Star was always seen and marketed as the graphical control system for a printer, that could do a few other office related tasks as well.

Saying Apple, Microsoft, Sun, BEos, Amiga and Atari 'stole' the Xerox Star GUI for their general purpose computer systems GUIs would make as much sense as saying Xerox 'stole' the idea of object based point and click GUIs from Ivan Sutherland's Sketchpad.

ps. OS X is *not* a mod of freebsd. It uses some of freebsd's user land, but the kernel and core OS of XNU is completely different, as is the user shell and GUI, having originated from NeXTSTEP.

pps. Saying Apple copied NeXTSTEP would be a bit silly, since NeXT was Steve Jobs's company during his hiatus from Apple.